# MermaidEditor vs Prompt 3

The clearest difference is price: Prompt 3 at Free against MermaidEditor's $3.99. Prompt 3 also leads on rating (4.3 vs 2.3) and ratings volume (376 vs 10). MermaidEditor's advantage is in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 6 weeks). On review sentiment, ads, monetization model and device support there is nothing between them.

Prompt 3 is free to download; MermaidEditor costs $3.99 up front. Prompt 3 sells 2 in-app purchases, starting at $9.99 per year. MermaidEditor asks for nothing beyond the download.

Prompt 3 holds the better App Store score, 4.3 against 2.3. That said, the two scores are not equally well evidenced: Prompt 3 has 376 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 14% of MermaidEditor's written reviews are positive against 22% of Prompt 3's.

MermaidEditor ships an update every 3 weeks, Prompt 3 every 6 weeks. Both last shipped on October 27, 2026.

## The numbers

| Metric | MermaidEditor | Prompt 3 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [2.3 (10 ratings)](https://appshunter.io/ios/app/mermaideditor/id1581312955/reviews) | **[4.3 (376 ratings)](https://appshunter.io/ios/app/prompt-3/id1594420480/reviews)** |
| Number of ratings | 10 | **376** |
| Positive reviews | 13.8% of reviews | **21.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Paid | Paid |
| Best chart rank | #117 | **#22** |
| Size | 125 MB | 46 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, Mac, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [基伟 徐](https://appshunter.io/developer/391905315) | [Panic, Inc.](https://appshunter.io/developer/403388568) |

## What reviewers say

### MermaidEditor

[App page](https://appshunter.io/ios/app/mermaideditor/id1581312955)

**Currently charting:** #117 Top Paid · Developer Tools (US App Store)

Create and edit diagrams and charts using mermaid-js syntax with real-time preview. Export your creations as PNG or SVG files and share them across all your Apple devices.

**Highlights:** Mermaid-js syntax highlighting, Code completion, Instant preview, Export to PNG/SVG, Cross-device editing, QuickLook preview extension

**Features:** Vision Pro support

**In-app purchases:** none


### Prompt 3

[App page](https://appshunter.io/ios/app/prompt-3/id1594420480)

**Currently charting:** #22 Top Grossing · Developer Tools, #174 Top Free · Developer Tools (US App Store)

A fully-native terminal emulator for Apple devices, offering robust connectivity for SSH, Mosh, and more. It features fast emulation, customizable clips, secure authentication, and cross-device syncing for a seamless experience.

**Highlights:** Native terminal emulator, SSH, Mosh, Eternal Terminal, Telnet support, Panic Sync for cross-device server syncing, Superfast emulation with GPU acceleration, Customizable clips for commands, FaceID/TouchID authentication, Jump Hosts and Agent Forwarding

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prompt 3 iOS + Mac (Annual) | $9.99 | per year |
| Prompt 3 One Time | $49.99 | one-time |

**What reviewers like**

- 🚀 Fast and powerful
- 🔒 Secure with Secure Enclave support
- 👍 Great admin tool
- 👍 Continues to improve over time
- 👍 Fantastic terminal emulator on iPad

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Buggy and unreliable
- 🚫 Subscription required for full functionality
- 💰 Extremely expensive, especially for existing users
- 🤔 Lacks features compared to competitors

**Reported bugs**

- Server list randomly disappears with Panic Sync
- Crashes when connected to external monitor
- Black screen issues with custom font configurations
- Sync issues causing data loss
- Vertical display sync issues

**Requested features**

- Shortcuts support on macOS
- Ability to click and select within commands
- Local shell option
- Run clips on server connection
- Export/backup clips


## Frequently asked questions

### Is MermaidEditor free?

MermaidEditor costs $3.99, with no in-app purchases.

### Is Prompt 3 free?

Prompt 3 is free to download, with in-app purchases available.

### Which has better reviews, MermaidEditor or Prompt 3?

Prompt 3 is rated higher. MermaidEditor averages 2.3 out of 5 from 10 ratings, while Prompt 3 averages 4.3 from 376 ratings.

### Do MermaidEditor or Prompt 3 have ads?

Neither MermaidEditor nor Prompt 3 shows ads.

### Which is updated more often, MermaidEditor or Prompt 3?

MermaidEditor ships an update every 3 weeks, and Prompt 3 every 6 weeks. Most recently, MermaidEditor was updated on October 27, 2026 and Prompt 3 on October 27, 2026.

### Which is more popular, MermaidEditor or Prompt 3?

MermaidEditor currently peaks at #117 in the App Store charts, and Prompt 3 at #22. Chart position reflects recent download velocity rather than total install base.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*